package com.leyou.item.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.leyou.item.dto.CategoryDTO;
import com.leyou.item.entity.Category;
import com.leyou.item.entity.CategoryBrand;
import com.leyou.item.mapper.CategoryMapper;
import com.leyou.item.service.CategoryBrandService;
import com.leyou.item.service.CategoryService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Service
public class CategoryServiceImpl extends ServiceImpl<CategoryMapper, Category> implements CategoryService {

    @Autowired
    private CategoryBrandService categoryBrandService;

    @Override
    public List<CategoryDTO> queryCategoryByPid(Long pid) {

        //select * from tb_category where parent_id = pid
        List<Category> categories = query()
                .eq("parent_id", pid)
                .list();


//        List<CategoryDTO> categoryDTOS = new ArrayList<>();
//
//        for (Category category : categories) {
//            CategoryDTO categoryDTO = new CategoryDTO();
//            BeanUtils.copyProperties(category,categoryDTO);
//            categoryDTOS.add(categoryDTO);
//        }
        List<CategoryDTO> categoryDTOS = CategoryDTO.convertEntityList(categories);

        return categoryDTOS;
    }

    @Override
    public CategoryDTO queryCategoryById(Long id) {

        return new CategoryDTO(this.getById(id));
    }

    @Override
    public List<CategoryDTO> listCategoryByIds(List<Long> ids) {

        return CategoryDTO.convertEntityList(listByIds(ids));
    }

    @Override
    public List<CategoryDTO> queryCategoryByBrand(Long bid) {

        //根据品牌id查询中间表，获取中间表的对象集合
        List<CategoryBrand> categoryBrands = this.categoryBrandService
                .query()
                .eq("brand_id", bid)
                .list();

        //从中间表的对象集合中获取分类id的集合
        List<Long> categoryIds = categoryBrands
                .stream()
                .map(CategoryBrand::getCategoryId)
                .collect(Collectors.toList());

        //
        return listCategoryByIds(categoryIds);
    }
}
